Slip rotation for rock drills



June 9, 1931. v

G. c. PEARSON $1.11 ROTATION FOR ROCK DRILLS Filed June l', 1928 v 2 Sheets-Sheet l Ill v June 9, 1931, G. c. PEARSON v SLIP ROTATION FOR ROCK DR ILLS Filed June. 12. 192a 2 Sheets-Sheet -2 attorney Patented June '9, 1931 UNITED STATES PATENT OFFICE GUSTAV C. PEARSON, OF DENVER, COLORADO, ASSIGNOR TO GARDNER-DENVER COM- PANY, OF DENVER, COLORADO, A CORPORATION OF DELAWARE SLIP ROTATION ROCK DRILLS Application filed June i2} The present invention relates to rock drills of the type in which a reciprocatory piston is given a step-by-step rotation,

which gives a corresponding rotation to the handle grip that is disposed substantlally f chuck and drill steel.

The object is to provide ratchet mechanism under the control of the operator, sof

'mounting of the handle, a cylindrlcal portion 21 constituting a bearing for the collar. "1 22 of a supplemental handle, havin a grip that said ratchet mechanism can be held}? in effective operation or released to prevent:

the rotary movement of the piston, chuck and steel.

In the accompanying drawings: Figure 1 is a view in elevation of a portion of a rock drill equipped with the novel mechanism.

Figure 2 is a longitudinal sectional View therethrough.

Figure 3 is a cross sectional view on the line 3-3 of Figure 2. I

Figure 4 is a detail sectional view on the line 4- 1: of Figure 3.

In the embodiment disclosed, a cylinder member 5 is employed, within which is a reciprocatory piston 6 that is capable of rotary movement and is slidably interfitted with a rotary steel holding chuck as is well known to the art, and is therefore not illustrated. The rotary'movement of the piston 6 is effected by a rifle bar 7 having a slidable interfitting engagement with a nut 8 located in the rear end of the piston 6. This rifle bar has a rear ratchet head 9 carrying a plurality ofpivoted pawls 10 that are pressed outwardly by spring plungers 11. These-pawls 10 cooperate with the teeth 12 of a ratchet ring 13 rotatably mounted in the rear end of the cylinder member 5.

A tangentially disposed detent 14 is mounted to reciprocate in a guideway 15 formed in the cylinder member 5, the inner end of said detent being adapted to engage in any of a series of sockets 16 formed in the periphery of the ratchet ring 13. lVhen so engaged obviously the ratchet ring 13 cannot rotate. o

Fixed to one side of the cylinder member 5 is a holding handle for the tool or drill.

This is preferably in the shape. of a U- shaped rod or bar, one end portion 17 of it. Serial No. 284,688.

which is tapered and fastened in a socket 18 formed in a projection 19 on the side of the cylinder member. The other leg of this handle, designated 20, constitutes a parallel to the cylinder 5 in spaced relation thereto. The leg 17 has adjacent to' the 23 located alongside the grip 20. he handle 23 is thus pivotally mounted on the cylinder member and is provided with an offset lug 24 that bears upon the outer end of the detent pin 14. The supplemental handle 23 is provided with an enlargement 25, in which is a socket 26 and in this socket is a plunger 27 that bears against the cyl: inder. The plunger is borne against by a spring 28 locatedin the socket.

With this structure, it will be evident that the plunger 27 and spring 28 serve to normally press the lug 24 against the outer end of the detent 14, and thus urge said detent into engagement with the ratchet ring 13 and into one of the sockets 16,as illustrated in Figure 3. This pressure can be increased by the operator of the tool grasping the handle grip 23 when he grasps the holding handle 20 of the tool. He thus secures the ratchet ring'13 against movement, so that as the 7 he can grasp the'supplemental handle grip 23 and holding the same, the lug 24 is drawn away from the detent, the detent is forced out by the rotary strain 'upon the clutch ring, and such clutch rin will thus be' free to rotate. Indeed it has een found that if both handles are freed from the grasp of .the operator as the drill body starts to rotate, the momentum will be sufficient to release ,the pin 14 and it will move out of the recess 16 in which it is engaged so as to release the ratchet ring 13.

' From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art with- 5 out further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without depart- 'ing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. In apparatus as set forth, the combination with a cylinder member, a reciprocatory piston therein capable of rotation, and means for effecting its rotation including a riflle bar with which the piston slidably engages, of ratchet mechanism for effecting the rotation of the rifle bar, including a ratchet ring, a pivotally mounted handle on the exterior of the cylinder member, means actuated by the handle for holding the ring against rotation, and means for urging the handle in a direction to cause said means to hold the ring.

2. In apparatus as set forth, the combination with a cylinder member, a reciprocatory piston therein capable of rotation, and means for eflecting its rotation including a rifle bar with which the piston slidably engages, of-ratchet mechanism for efiecting the rotation of the rifle bar including a ratchet ring, a pivotally mounted handle on the exterior of the cylinder member, a detent slidably mounted in the cylinder member and e aging the ring to hold it, said detent being orne against by the handle, and a spring operating on the handle to cause it to continually thus bear.

3. In apparatus as set forth, the combinationwith a cylinder member, a reciprocatory piston therein capable of rotation, and means or effecting its rotation including a rifle bar with which the piston slidably engages, of ratchet mechanism for effecting the rotation of the rifle bar including a ratchet ring, a handle fixed to the cylinder member for holding the apparatus, a detent that engages the ring to hold it against movement, and a handle for actuating the detent mounted on the holding handle.

4. In apparatus as set forth, the combination with a cylinder member, a reciprocatory piston therein capable of rotation and means or efiecting its rotation including a-rifie.

.bar with which the piston slidably engages,

of ratchet mechanism for effecting the rotation of the rifle bar, including a ratchet ring,

a handle fixed to the cylinder member for holding the apparatus, a detent that engages the ring to hold it against movement, an a handle for actuatin the detent pivotally mounted on the holding handle and adapted to be grasped therew1th.'

5. In apparatus as set forth, the combina- 5 tion with a cylinder member, a reciprocatory ,fatchet mechanism for eflecting the rotation of the rifle bar, including a ratchet ring, a handle fixed to the cylinder member for holding the apparatus, a detent reciprocably mounted in the cylinder member and engaging the ratchet ring to hold it against rotation, a handle journaled on the holding handle and engaging the detent, said handles having grip portions adjacent each other, and a spring bearing against the second handle for urging it into bearing against the detent.

6. In apparatus of the character set forth, the combination with a cylinder member, a handle for holding it, a reciprocatory piston therein capable of rotation, and means for effecting its rotation including a rifle bar, with which the piston slidably engages, of ratchet mechanism for effecting the rotation of the rifle bar including a ratchet ring, a movabledetent that detachably engages the ratchet ring for holding it against rotation, and means for, controlling the movement of the detent to hold or release the ratchet ring including a supplemental handle having a sleeve portion that surrounds and is journaled to rotate on a portion of the 'cylindervholding handle, said supplemental handle being adapted to be grasped and operated by a hand holding the cylinder handle. I

7. In apparatus of the character set forth, 100 the combination with a cylinder member, a handle for holdin it, a reciprocatory piston therein capable o rotation, and means for effecting its rotation including a rifle bar with which the piston slidably engages, of 105 ratchet mechanism for effecting the rotation of the rifle bar includinga ratchet ring, a

' chamber in-which the ratchet ring is rotatably mounted, a longitudinally reciprocable of the operator graspin the cylin er handle.

In testimony whereo I aifix m signature.

- I GUSTAV C. P ARSON 

